Usually too much moisture is to blame
If the needles turn brown and fall off, there are two possible reasons: Either the rosemary concerned is too wet or too dry. So, before you get down to treating the plant, find out the correct cause. In most cases, however, you should add too much water to your rosemary, true to the old gardening adage “More plants have been watered to death than they have dried up”. Too high humidity, too much irrigation water and, in particular, waterlogging lead to the fact that the roots of the rosemary rot and ultimately can no longer supply the above-ground parts of the plant. In this case, the only thing that helps is to dig up or repot the rosemary and plant it again in a new place or pot in fresh substrate - of course,after the rotting roots have been pruned.
also read
- Rosemary loves poor soil
- Rosemary gets yellow needles - what to do?
- Pour the rosemary only a little
Brown needles from pest infestation
However, brown needles can also have another cause, namely an infestation with pests such as spider mites, scale insects or tripods. Fungal diseases are also quite common. The gardener usually notices a pest or fungal attack towards the end of winter, especially when the plant has overwintered indoors. The cause is often too warm overwintering and, as a result, too low humidity. Many pests love dry heating air and attack dry plants, which are also weakened by overwintering and are therefore more susceptible. Examine your rosemary carefully and look out for small animals, especially on the underside of the leaves - these are often only a few millimeters long and not always visible to the naked eye.
Tips & Tricks
First try to control the pests or fungi with biological means. Chemical pesticides (e.g. fungicides) must never be used on a plant that is intended for consumption! A higher level of humidity often helps against unwanted animals, powdery mildew and other fungi can be treated with a garlic stock.
IJA
